The invention relates to the technical field of apple cap bags, in particular to a plastic uptake vacuum double-layer transparent cap bag which is characterized in that a vacuum layer is arranged in the middle of the vacuum double-layer transparent cap bag, the thickness of the vacuum layer is 0.2 centimeter, the transparent cap bag is made of PE (polyethylene) corn starch composite materials, the thickness of the transparent cap bag is 0.2 centimeter, 7 first semicircular grooves, 44 first breathable grooves and a fruit stem bayonet A are formed in a semi-spherical surface A, a fruit stem hanging port A, a convex point (6) and a first L-shaped opening are formed in a folded surface A, 7 second semicircular grooves, 44 first breathable grooves and a fruit stem bayonet B are formed in a semi-spherical surface B, a fruit stem hanging port B, a notch (11) and a second L-shaped opening are formed in a folded surface B, the semi-spherical surface A rotates along a connector (17) by 180 degrees, the folded surface A and the folded surface B cling to each other, and the convex point (6) is pressed into the notch (11).